ORA-00904 Trying to merge two tables - sql

Question

Trying to merge 2 tables. Having issues merging them
If NAME_CINTAS_ column from Locker_audit table is the same as NAME from Locker_Term_List Table, I want the column 'Term_Employee' to update to a value of 'yes' in the Locker Audit table
merge into locker_audit a
using locker_term_list b
on (a.name_cintas_ = b.name)
when matched then update set
a.term_employee = 'yes';
I receive this error
[![enter image description here][1]][1]
Error at line 3/13: ORA-00904: "A"."NAME_CINTAS_": invalid identifier
ORA-06512: at "SYS.WWV_DBMS_SQL_APEX_220100", line 847
ORA-06512: at "SYS.DBMS_SYS_SQL", line 1658
ORA-06512: at "SYS.WWV_DBMS_SQL_APEX_220100", line 833
ORA-06512: at "APEX_220100.WWV_FLOW_DYNAMIC_EXEC", line 1903
1. merge into locker_audit a
2. using locker_term_list b
3. on (a.name_cintas_ = b.name)
4. when matched then update set
5. a.term_employee = 'yes';
if I try adding the word as I get a different error:
merge into locker_audit as a
using locker_term_list as b
on (a.name_cintas_ = b.name)
when matched then update set
a.term_employee = 'yes';